Clamp for holding printers  chases on beds of printing-presses



(No M0691. v

G. H; PRATT 8a A. I. PAINE.

CLAMP FOR HOLDING PRINTERSOHASES 0N BEDS 0P PRINTING PRESSBS.

No. 501,231. Patented July 11, 1893.

v v v I \/E 'TE] 5. 1 L 7 N K 073%, Jyihez'r v UNITED STATES ATENT OFFIGE.

GEORGE H. PRATT AND ALTEMUS I. PAINE, OF NEWTON, MASSACHUSETTS.

CLAMP FOR HOLDING PRINTERS CHASES ON BEDS OF PRINTING-PRESSES.

SPECIFICATION forming part Of Letters Patent NO. 501,231, dated July 11, 1893.

Application filed I'ehruary 8, 1893. Serial No. 460,892. (No model.)

To aZZ whom it may concern.-

Be it known that we, GEORGE I-I. PRATT and ALTEMUs I. PAINE, citizens of the United States, residing in Newton, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Clamps for Holding Printers Chases on Beds of Printing-Presses, of which the followingis a specification.

This is an improved adjustable clamp adapted to be secured to the edge of the bed of a printing press for the purpose of setting up against and holding securely in position on such bed a chase containing a form of type, the clamp being so constructed that the chase can be quicklylocked or clamped without the use of printers furniture, whether the edge of the chase is a little inside or a little outside of, or fiush with, the edge of the bed, and will be held firmly in such position during the process of printing. In practice, several of these clamps would probably be used for holding a single chase. Only one is shown however, in position in connection with a portion of a bed and chase.

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure 1 is a plan View of our invention in use. Fig. 2 is an elevation of the rear or outer side with the sliding jaw or clamp proper removed. Fig. 3 is a central transverse section of the device. Fig. 4 is an elevation of the sliding jaw or sliding clamp removed.

A represents a portion of the bed of an ordinary printing press, B a portion of the chase (or frame for holding a form of type), C the form of type, and D the ordinary furniture for looking it up in the chase B.

E is the main portion or body of the clamp horizontally bored to receive bolts e which screw into the edge of the bed A and thus secure the device to said bed. The main portion E is preferably of the same thickness as the bed, but if the thickness be not the same it is so secured to the bed that its ripper surface will be flush with the upper surface of said bed. This main portion E is provided with transverse horizontal grooves, preferably three in number and of substantially the shape shown. Of these, F is the central groove and is broader and deeper than the two side grooves F, which are parallel with the groove F. All of them are preferably rectangular in cross section.

H is a sliding jaw or clamp proper resting on the top of the main portion E, and provided with three legs or tongues, the central one of which, E, extends down into and fits within the central groove F, and the two side ones, H", of which, extend down into and fit within the side grooves F.

I is a plate secured to the outer side of the main portion E by means of screws f, and K is a screw or bolt running in a correspondingly threaded horizontal opening in the plate I,

and extending through said plate into the central groove F, as shown. This screw or bolt is actuated by an ordinary hand lever K extending from its head.

L L are ordinary wire pins or keys with their outer ends formed into a coil or ring, and their inner ends lying in holes shown at broken lines g, Fig. 2, one-half of the circumference of each of said holes beingformed in the outer edge of a groove F, and the other corresponding half being formed in the outer edge of a leg or tongue H.

In practice, our device is usually kept constantly secured to the bed by means of the screws e with its upper surface flush with the surface of said bed, and with the sliding jaw H removed as shown in Fig. 2. A

chase or form of type is slid over the clamp or clamps onto the bed A, and the sliding jaw or adjusting clamp H is dropped into the postion shown in Figs. 1 and 3, that is, with its legs H and H in the grooves F F. The locking keys or steadying pins L are then inserted, as above described, so that the jaw H cannot jump or be lifted from its position. The bolt or screw K is then operated by means of its handle K so as to slide the jaw or clamp H in the grooves and force it tightly against the chase B. It will be noticed by reference to Fig. 3 that the sliding jaw H is provided with a lip H. In case the chase B projects slightly beyond the edge of the bed A, the plain or unbroken face of the sliding jaw will be presented to the chase as shown in Fig. 3; but should the edge of the chase be slightly within the edge of the bed A, the sliding jaw H would be dropped into its position with the lip projecting toward the bed, so that as the jaw was forced up by the screw K, the lip H would overhang the bed and reach the chase. The two faces of the sliding jaw may be smooth or somewhat roughened as desired. As many of these clamps may be used as deemed necessary and they may be placed on opposite sides of the bed or on one side only, in which latter case they would force the chase against some portion of the press opposite the clamp.

The quickness with which forms can be locked up by means of this device, and the fact that no furniture is needed between the clamp and the chase, are important advantages.

"bed, substantially as described.

GEORGE H. PRATT. ALTEMUS I. PAINE.

Witnesses:

HENRY W. WILLIAMS,- J. M. IIARTNETT. 

